Printing cylinder



w. GAMBLE ET AL June '10 ,v 1924.

PRINTING CYLINDER Original Filed se ta, 1922 2 Sheets-:Sheel 1 w; GAMBLE'ET AL PRINTING CYLINDER" I ginal Pi-led Sept. 192';

2 Sheets -Shee.t 2

Patented dune 10, 1924.-

Nrrao WILLIAM GAMBLE AND MALCOLM OWEN, OF LONDON, ENGLAND; SAID GAMBLE AS- QFFIC srenoa no A- w. rnnaosa Am) eommnr LIMITED. or LOND N, ENGLAND.

rmn'rme cninnna.

Original application filed September 8, 1922, Serial No. 587,014. Divided and this application filed J'u ne 12, 923. Serial No. ($44,901.

ders, of which the following is a apecificav tion.

This invention relates to printing cylinders of the kind having a gap in which the ends of the printing sheet are fastened. In our prior application Serial No. 587,014, filed 8th September, 1922, which eventuated in Patent No. 1,458 447 and of which the present case is a ivisi'on, we have described a method of applying sheets for use as a printing surface to printing cylinders, wherein one end of the sheet is attached on one side of the gap of the cylinder and the sheet is stressed mechanically under tension tangentially to the cylindrical surface, the cylinder being held against rotation during the initial straining and then while the strain is maintained, rotated to wrap the sheet tightly around it, whereon the other end of the sheet is fixed within the gap aforesaid.

The objectof the present invention is to construct the cylinder so that one end of the sheet may be anchored, then tension applied, and ultimately the sheet fitted completely to the cylinder while the strain is maintained, and another object is to provide a sheet particularly constructed so that when under tension it does not becomedistorted in a. manner likely to afl'ect the etched surface.

According to the present invention a cylinder for. use in rotary intaglio or photo-:

gravur printing machines is provided with means for securing the free end of a sheet of material, adapted to be wrapped around the cylinder, comprisin a distance piece and a capping piece apted to be fixed thereto in order to secure said free end of the sheet between them, the distance piece and capping piece being disposed within a slot formed transversely of the periphery of the cylinder.

In the accompanying drawings is shown by way of example a construction embodying the present invention:

Fig. 1 being an end view of a printing cylinder constructed according to the present inventionshowing the method of dprlcr' t 0 viding pegs for attaching the sheet, an initial position of the sheet for a Wrapping operation; I

.Fig. 2 is a similar view showing the position of the parts at the final movement of the wrapping operation and at the beginning of the final clainping of the sheet; Fig. 3 is a detail view showing the presser members, hereinafter referred to, associated with a dove-tailed base portion .of the capping piece; I

Fig. 4 is a part pictorial view to a larger scale clearly indicating a cylinder having a gap inclined to the axis of the cylinder and provided with means for fixing the two ends of the sheet, as illustrated in Figs. 1, 2 and 3, but showing the operation completed. In this figure the latch is partly broken away for sake-of clearness.

- Fig. 5 is a. complete perspective view to a reduced scal of the cylinder shown in Fig.

4, clearly indicating the rake of the slot;

ing the sheet 5 to be under tension for application to the cylinder 1, according to the process described in our earlier patent application Serial No. 587,014, the cylinder 1 will be rotated until the sheet 5 is wrapped around it and the free end of the sheet overlies the slot 2, but in order to prevent detachment of the sheet 5 from the pegs 4, a distance piece 6 is disposed within the slot 2 and on the jaw 3, previous to the cylinder 1 being rolled forithe wrapping operation, latches such as 7 being pivoted at each end of the cylinder to be fastened over a lug 8 of the distance piece 6 to prevent it moving out of the slot during the said rotary movement of the cylinder 1. The latches are .omitted from Fig. 2 for news;

-re s n sake of elearness. The sheet having been wrapped around the cylinder, the base portion 9 of a capping p1ece is placed over the sheet, the base portion being associated with a sectional presser member, clearly indicated in Fig. 3 and generally ind1cated by the reference numeral 10. The 'presser member 10 and base portion 9 are then thrust into the slot by rotating bolts 11, which extend through-the sections oil. the resser member, the base portion 9 of the the sheet 5, the distance iece 6, and the jaw 3 within the slot,thereby firmly clamping the free end of thesheet 5 against the distance piece 6. In the final position the dove-tailed base portion 9 is tightly engaging the distance piece 6, holding the free end of the sheet sandwiched therebetween. This will be clearly understood by reference to Fig. t.

The final position having been reached, the sections of the presser member 10 are removed progressivelyone by one, and the bolts 11 replaced by shorter bolts 12 (Fig. i) having their heads countersunk in the base portion 9 of the capping piece. Then in order to cover the heads and to fill the slot of the cylinder, the undercut top portion of the cappin iece, indicated by the numoral-13, is sit over the base portion 9 from one end progressively as the bolts 11 are replaced, thereby securing said top and bottom portions together.

it will be understood that the construction will be the same whether the slot is parallel to the axis of the cylinder or when it is inclined thereto asshown in Fig. 5 of the'drawings. I

When the slot is oblique the angle is such that the doctor is always provided with a supporting surface while passing over. a

'joint between the copper surface and the capping piece.

The rake of the slot in the printing cylinder is preferably not less than one inch in ninety-six inches.

lit should be particularly noted that by the manner offixing the printing sheet comprised in the present invention, only a narrow slit in the cylinder is necessary.

By the use of an oblique slot any clicking noise whilst'performing the wipe is substantially eliminated. Further, the doctor -is maintained at a constant pressure while passing over a joint due to its narrow character and to the fact that the doctor is. carried by the second half of the rake before leaving the first, thus obtaining a clean wipe at every impression.

Vl hen an oblique slot is formed in the periphery of the cylinder, thereby giving efiicient support to the doctor as it passes over a joint, the doctor need not be snpported by a capping piece having its outer face a level with the periphery of the cylinder, as

memes t e rising of the doctor from a lower level would be gradual. Further also, the usual mechanism for reciprocating the doctor and withstand without distortion the tension applied for the wrapping operation and also be suitable for the final clamping operation rei erred to, it is provided at each end with perforations as shown in Fig. 6, and one or both ends are reinforced, for instance, by rolling it over a rod 14:.

In operation, a rod 14: will lie immediately below the pegs t in the slot 2, so that the sheet will be reinforced, and tearing of the sheet is prevented when tension is applied to the sheet for wrapping operations. The other end of the sheet may be similarly formed, but in any case is perforated as shown at 15 for the passage of bolts 11, 12.

The final clamping operation having been efi'ectedft-he free end of the sheet 5 is scored along the ed e of the capping piece and fraetured'by bending it to and fro.

By our invention we provide a simple and effective means for securing a sheet on a printing roller, and improve the sheet. Whether the sheet is to be made of copper, zinc, rubber, celluloid, hardened gelatine, or other known material utilized for printing surfaces.

We claim 1. A printing cylinder having a. gap, a distance piece in said gap, means for securing said distance piece in said gap, a divided capping piece adapted to fit over said distance piece within the gap, said capping piece including a bottom portion adapted to fit over said distance piece and be bolted thereto, a top'portion adapted to slide over said bottom portion, and fixing means securing said top portion to said bottom portion.

2. A printing cylinder having a gap, a distance piece in said gap, means for securmg said distance piece in said gap, a divided capping piece adapted to fit over said distance piece within the gap, said capping piece including a dove-tailed bottom portion adapted to fit over said distance piece, bolts'for fixing said bottom .portion to said distance piece, and an undercut top'portion adapted to slide over said dove-tailed bottom portion and cover the heads of said bolts.

3. A printing cylinder having a gap, at distance piece'in said gap means for securing said distance piece in said gap, a di vided capping piece adapted to fit over said distance piece within the gap, said capping piece including a dove-tailed bottom portion adapted to fit over said distance piece,

bolts for fixing said bottom portion to said distance piece, an undercut top portion adapted to slide over said dove-tailed bot- J.

- jaw arranged in said gap, pegs on sa1 .40

tom portion and cover the heads of said bolts, and a sectional presser member and temporary fixing means for securlng sa1d presser member and said bottom portion to said distance piece.

4. A printing cylinder having a gap, adistance piece in said, gap, means for securing said distance piece in said gap, a divided capping piece adapted to fit over said distance piece within the gap, said capping piece including a dove-tailed bottom portion adapted to fit over said distance piece, bolts for fixing "said bottom portion to said distance piece, an undercut top portion adapted to slide over said dove-tailed bottom portion and cover the heads of said bolts, and a sectional presser member adapted to be bolted in sections to said distance piece by bolts passing through said bottom portion, said bolts being progressively substituted by the first mentioned fixing bolts of the said bottom portion, the presser member being removed in sections and the undercut top portion slid progressively over said bottom portion.

5. A printing cylinder having a gap, a jaw arranged in said gap, pegs on said jaw, a distance piece adapted to fit the gap opposite said pegs, means for securing said distance piece in said gap, a divided capping piece adapted to fit over said distance piece within the gap, said capping piece including a bottom portion adapted to fit over said distance piece and be bolted thereto, a top portion adapted to slide over said bottom portion, and fixing means securing said top portion to said bottom portion.

6. A printing cylinder having a gap, a

jaw, a distance piece adapted to fit the gap opposite said pegs, means for securing said distance piece in said gap, a divided capping piece adapted tofit over said distance piece within the gap, said capping piece including a dove-tailed bottom portion adapted to fit over said distance piece,

bolts for fixing said bottom portion to said distance piece, and an undercut top portion adapted to slide over said dove-tailed bottom portion and cover the heads of said bolts.

7. A printing cylinder having a gap, a jaw arranged in said gap, pegs on sai jaw, a distance piece adapted to fit the gap opposite said pegs, means for securing said .distance piece in said gap, a divided cappmg piece adapted to fit over said distance piece within the gap, said capping piece including a dove-tailed bottom portion adapted to fit over said distance piece, bolts for fixing said bottom portion to said distance piece, an undercut top portion adapted to slide over said dove-tailed bot tom portion and cover the heads .of said bolts, and a sectional presser member secure said distance piece within and temporary fixing means for securing said presser member and said bottom portion to said distance piece.

' 8. A printing cylinder having a gap, a jaw arranged m said gap, pegs -on said jaw, a distance piece adapted to fit the gap opposite said pegs, means for securing said distance piece in said gap, a divided capping piece adapted to fit over said distance piece within the gap, said capping piece including a dove-tailed bottom portion adapted to fit over said distance piece, bolts for fixing said bottom portion to said distance piece, an undercut top portion adapted to slide over said dove-tailed bottom portion and cover the heads of said bolts, and a sectional presser member adapted to be bolted in sections to said distance piece by bolts passing through said bottom portion, said bolts being progressively substituted by the first mentioned fixing bolts of the said bottom portion, the presser member being removed in sections and the undercut top portion slid progressively over said bottom portion.

9. A printing cylinder having a gap, a distance piece in said gap, a lug at each end of said distance piece protruding beyond the gap, a latch pivoted to said cylinder adjacent to engage said lug and securesaid distance piece within said gap, a divided 'capp mg piece adapted to fit over said dlstance piece within the gap, said capping plece including a bottom portion adapted to fit over said distance piece and be bolted thereto, a top portion adaptedto slide over sa1d bottom portion, and fixing means securing said d top portion to said bottom portion.

10'. A printing cylinder having a gap, a jaw arranged in said gap, pegs on sa1d aw, a distance piece adapted to fit the gap opp osite said pegs, a lug at each end of said distance piece protruding beyond the gap, a-

latch pivoted to said cylinder adjacent each said lug and adapted toengage sa1d lug and said gap, a divided capping piece adapted to fit over said distance piece within the gap, sa1d capping 'piec-e' including a bottom portion adapted to fit over said distance piece and be bolted thereto, a top portion adapted to d slide over said bottom portion, and fixing means securing said top portion to said bottom portion.

11. A printing cylinder having a gap, a jaw arranged in said gap, pegs on said aw, a distance piece adapted to fit the gap o-pp osite said pegs, a lug at each end of sa1d distance piece protruding beyond the gap, a latch pivoted to said cylinder adjacent each said lug and adapted to engage sa1d lug and secure said distance piece within sa1d gap, a divided capping piece adapted to fit over said distance piece within the gap, sa1d capeach said lug and adapted I site said pegs, means for securing said by bolts passing through said bottom r tion, said bolts being progressively utituted by the first mentioned fixing bolts of the said bottom portion, the pnesser member being removed in sections and the nndercnt top portion slid progressively ever said bottom portion.

12. A. printing cylinder having a gap inclined to the axis of the cylinder, a distance piece in said gap, means for securing said distance piece in said gap, a divided capping piece adapted to fit over said distance within the gap, said capping piece including a bottom portion adapted to fit over said distance piece and bebolted thereto 'a top portion adapted to slide over said ottom portion, and fixing means securing said top portion to said bottom portion.

13. A printingcylinder having a gap inclined to the axis of the cylinder, a jaw arranged in said gap, pegs on said jaw, a distance piece adapted to fit the gap oppotance piece in said gap, a divid piece adapted to fit over said distance piece within the gap, said cappin pieceinclueing a bottom portion a t d to fit over said distance niece and be bolted thereto, a top portion .epted to slide over said bottom portion, an fixing means securing said top portion to said bottom portion.

14:. A printin cylinder having an in clined gap forms at a rake cit one-1n ninetymemes six, a distance piece in said gap, means for securing said distance piece in said gap, a divided capping gplece adapted to fit over said distance piece within the gap, said cap distance piece protruding beyond the gap,

a latch pivoted to said cylinder adjacent each said lug and adapted to engage said lug and secure said distance piece within said gap, a divided capping piece adapted to fit over said distance piece within the g ,said capping piece including a dove-taled bottom portion adapted to fit over said distance piece, bolts for fixing said bottom portion to said distance piece, an undercut top portion adapted to slide "over said dove-tailed bottom portion and cover the heads of said bolts, and a sectional presser member adapted to be bolted in sections to said distance piece by bolts passing through said bottom portion, said bolts being progressively substitiited b the first mentioned fixing bolts of the sai bottom portion, the presser member being removed 1n sections and the undercut top portion slid progressively over said bottom portion.

In testimony whereof we afix our signatures.

WILLIAM senses. MALCOLM owns. 

